fix: fallback to hickory_resolver's default config if reading /etc/resolv.conf fails #2797
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On some platforms, for example Android, /etc/resolv.conf does not exist, so it becomes difficult to use hickory-dns with reqwest. This PR fixes this.
hickory-resolver's default is Google DNS, though I would suggest using Cloudflare DNS instead. Please let me know what you think.
Related hickory-dns issue: hickory-dns/hickory-dns#652.